Overview of Crash Recovery in Kdump

Kdump is a vital feature in Oracle Linux that helps to preserve the system in the event of a system failure. Kdump, when enabled, permanently reserves part of the system memory to capture and save kernel crash dump information for later analysis. Additionally, in the case of a kernel crash, Kdump safeguards the system by automatically booting into a clean and reliable second Linux kernel, called the captured kernel, which also resides as part of the reserved system memory.

Note:

The kdump service is initially enabled at the time of installation. If the Kdump package or the service wasn't configured at installation, administrators can install the package and enable the service from the command line.

When Kdump is properly configured on the host system, Cockpit administrators can use the Kdump application in the web console to view and manage Kdump configuration properties and test the Kdump configuration as needed.

Important:

The Kdump reserved memory usage property is configurable only from the command line.

For information about using the command line to install, enable, and reserve memory for Kdump, see Installing Kdump and Kdump Memory Reservation in one of the following locations:

• Oracle Linux 8: Managing Kernels and System Boot
• Oracle Linux 9: Managing Kernels and System Boot
• Oracle Linux 10: Managing Kernels and System Boot